CUSTOM REDMAN CB STOP Mic 636L Noise canceling mic wired 4 pin with Rubber Astatic CordAstatic 636L "Stars and Stripes" Special Edition Noise Canceling MicrophoneFor every mic sold, Astatic will donate $3.00 to help support the troops and their families.The industry standard for over 70 years. The 636L is a noise canceling dynamic microphone that was designed for close talking handheld applications in CB, Amateur Radio and SSB communications. The 636L is used in situations where there is high background noise levels, such as trucks. Our commercial version of this mic is used in public service agencies, such as fire departments all over the United States. The 636L has a rugged housing, polyurethane coated steel grille screen and a dependable low impedance dynamic element.